Its ge silicon 1 so no additives. I covered all the seams and exposed wood with it so there is alot, i wasnt aware not to do that at the time. I only smell if if i close the cage and then open it. I think im gonna install the heat panel and let it run for a bit. See if that helps. I was so excited to put her in there now im bummed i may have messed it up after working so hard on it.